A small amount of brown discharge in a woman in the 5th month of pregnancy may be caused by low lying placenta, placenta abruptio, cervical lesions and other factors. It is recommended to have regular pregnancy checkups, seek medical help to find out the cause if necessary, and let the doctor choose the appropriate treatment. 1. low placenta: mainly abnormal bleeding caused by localized abruption of low placenta and uterine wall, only a small amount of brown discharge comes out because the area of abruption is relatively small. In this case, absolute bed rest, antibiotics to prevent infection, and the application of drugs to inhibit contractions, glucocorticoids to promote fetal lung maturation, if repeated heavy bleeding need to terminate the pregnancy as appropriate; 2, placenta abruptio: women may cause placenta abruptio after external impact on the abdomen, a small amount of brown discharge, and accompanied by abdominal pain. It is recommended to apply glucocorticosteroids to promote fetal lung maturation and prolong the gestational week, as well as to closely monitor the placenta abruptio, and terminate the pregnancy immediately in case of obvious vaginal bleeding, high uterine tone, coagulation dysfunction, and fetal distress; 3. Premature miscarriage: if there is brown discharge, accompanied by stomach pain and fluid outflow, it is considered to be the precursor of miscarriage, and attention should be paid to bed rest and no strenuous exercise. If the above symptoms can be improved through rest, no special treatment is needed. If there is still bleeding, you should go to the hospital in time to apply drugs for fetal preservation treatment; 4. cervical lesions: if a small amount of brown discharge appears after intercourse or gynecological examination, you should consider contact bleeding caused by cervical lesions, such as cervical polyps and cervicitis, among which cervical polyps are generally recommended to be treated surgically. Therefore, when abnormalities are found during pregnancy, it is necessary to seek medical examination in a timely manner to clarify the cause and then carry out symptomatic treatment to avoid delaying the condition and affecting fetal development.